I got my acceptance email yesterday to check my online account. This link was in the letter:
http://gradschool.unc.edu/admissions/admittedstudents.html
It let me set up my email, create my ONYEN, and log in to my student account where I could view financial aid. The financial aid was still pending review, but it let me estimate my need and gave a breakdown of estimated cost of attendance.
The deadline that I was able to see through my acceptance letter online was April 15 with a $250 deposit.